| // Copyright 2018-2021 The Khronos Group Inc. |
| // |
| // SPDX-License-Identifier: CC-BY-4.0 |
| |
| [[decode-h265]] |
| == Video Decode of HEVC (ITU-T H.265) |
| |
| This extension adds H.265 codec specific structures needed for decode |
| session to execute decode jobs which include H.265 sequence header, picture |
| parameter header and quantization matrix etc. |
| Unless otherwise noted, all references to the H.265 specification are to the |
| 2013 edition published by the ITU-T, dated April 2013. |
| This specification is available at http://www.itu.int/rec/T-REC-H.265. |
| |
| |
| === H.265 decode profile |
| |
| A H.265 decode profile is specified using slink:VkVideoDecodeH265ProfileEXT |
| chained to slink:VkVideoProfileKHR when the codec-operation in |
| slink:VkVideoProfileKHR is |
| ename:VK_VIDEO_CODEC_OPERATION_DECODE_H265_BIT_EXT. |
| |
| [open,refpage='VkVideoDecodeH265ProfileEXT',desc='Structure specifying H.265 decode profile',type='structs'] |
| -- |
| The slink:VkVideoDecodeH265ProfileEXT structure is defined as: |
| |
| include::{generated}/api/structs/VkVideoDecodeH265ProfileEXT.txt[] |
| |
| * pname:sType is the type of this structure. |
| * pname:pNext is `NULL` or a pointer to a structure extending this |
| structure. |
| * pname:stdProfileIdc is a code:StdVideoH265ProfileIdc value specifying |
| the H.265 codec profile IDC. |
| |
| include::{generated}/validity/structs/VkVideoDecodeH265ProfileEXT.txt[] |
| -- |
| |
| |
| === Selecting an H.265 Profile |
| |
| When using flink:vkGetPhysicalDeviceVideoCapabilitiesKHR to query the |
| capabilities for the input pname:pVideoProfile with |
| pname:videoCodecOperation specified as |
| ename:VK_VIDEO_CODEC_OPERATION_DECODE_H265_BIT_EXT, a |
| slink:VkVideoDecodeH265ProfileEXT structure must: be chained to |
| slink:VkVideoProfileKHR to select a H.265 decode profile. |
| If supported, the implementation returns the capabilities associated with |
| the specified H.265 decode profile. |
| The requirement is similar when querying supported image formats using |
| flink:vkGetPhysicalDeviceVideoFormatPropertiesKHR. |
| |
| A supported H.265 decode profile must: be selected when creating a video |
| session by chaining slink:VkVideoDecodeH265ProfileEXT to the |
| slink:VkVideoProfileKHR field of slink:VkVideoSessionCreateInfoKHR. |
| |
| |
| === Capabilities |
| |
| [open,refpage='VkVideoDecodeH265CapabilitiesEXT',desc='Structure specifies H.265 decode capabilities parameters when decoding a frame',type='structs'] |
| -- |
| When uses flink:vkGetPhysicalDeviceVideoCapabilitiesKHR to query the |
| capabilities for the parameter pname:videoCodecOperation specified as |
| ename:VK_VIDEO_CODEC_OPERATION_DECODE_H265_BIT_EXT, |
| slink:VkVideoDecodeH265CapabilitiesEXT structure can: be chained to |
| slink:VkVideoCapabilitiesKHR to get this H.265 extension specific |
| capabilities. |
| |
| The slink:VkVideoDecodeH265CapabilitiesEXT structure is defined as: |
| |
| include::{generated}/api/structs/VkVideoDecodeH265CapabilitiesEXT.txt[] |
| * pname:sType is the type of this structure. |
| * pname:pNext is `NULL` or a pointer to a structure extending this |
| structure. |
| * pname:maxLevel is the maximum H.265 level supported by the device. |
| * pname:stdExtensionVersion is a slink:VkExtensionProperties structure |
| specifying the H.265 extension name and version supported by this |
| implementation. |
| |
| include::{generated}/validity/structs/VkVideoDecodeH265CapabilitiesEXT.txt[] |
| -- |
| |
| |
| === Create Infomation |
| |
| [open,refpage='VkVideoDecodeH265SessionCreateInfoEXT',desc='Structure specifies H.265 decode session creation parameters',type='structs'] |
| -- |
| A slink:VkVideoDecodeH265SessionCreateInfoEXT structure can: be chained to |
| slink:VkVideoSessionCreateInfoKHR when the function |
| flink:vkCreateVideoSessionKHR is called to create a video session for H.265 |
| decode operations. |
| |
| The slink:VkVideoDecodeH265SessionCreateInfoEXT structure is defined as: |
| |
| include::{generated}/api/structs/VkVideoDecodeH265SessionCreateInfoEXT.txt[] |
| * pname:sType is the type of this structure. |
| * pname:pNext is `NULL` or a pointer to a structure extending this |
| structure. |
| * pname:flags is reserved for future use. |
| * pname:pStdExtensionVersion is a pointer to a slink:VkExtensionProperties |
| structure specifying H.265 codec extensions. |
| |
| include::{generated}/validity/structs/VkVideoDecodeH265SessionCreateInfoEXT.txt[] |
| -- |
| |
| [open,refpage='VkVideoDecodeH265CreateFlagsEXT',desc='Reserved for future use',type='flags'] |
| -- |
| include::{generated}/api/flags/VkVideoDecodeH265CreateFlagsEXT.txt[] |
| |
| tname:VkVideoDecodeH265CreateFlagsEXT is a bitmask type for setting a mask, |
| but is currently reserved for future use. |
| -- |
| |
| |
| === Decoder Parameter Sets |
| |
| To reduce parameter traffic during decoding, the decoder parameter set |
| object supports storing H.265 SPS/PPS parameter sets that may be later |
| referenced during decoding. |
| |
| [open,refpage='VkVideoDecodeH265SessionParametersCreateInfoEXT',desc='Structure specifies H.265 decoder parameter set information',type='structs'] |
| -- |
| A sname:VkVideoDecodeH265SessionParametersCreateInfoEXT structure holding |
| one H.265 SPS and at least one H.265 PPS paramater set must: be chained to |
| sname:VkVideoSessionParametersCreateInfoKHR when calling |
| fname:vkCreateVideoSessionParametersKHR to store these parameter set(s) with |
| the decoder parameter set object for later reference. |
| The provided H.265 SPS/PPS parameters must: be within the limits specified |
| during decoder creation for the decoder specified in |
| sname:VkVideoSessionParametersCreateInfoKHR. |
| |
| The sname:VkVideoDecodeH265SessionParametersCreateInfoEXT structure is |
| defined as: |
| |
| include::{generated}/api/structs/VkVideoDecodeH265SessionParametersCreateInfoEXT.txt[] |
| * pname:sType is the type of this structure. |
| * pname:pNext is `NULL` or a pointer to a structure extending this |
| structure. |
| * pname:maxSpsStdCount is the maximum number of SPS parameters that the |
| sname:VkVideoSessionParametersKHR can contain. |
| * pname:maxPpsStdCount is the maximum number of PPS parameters that the |
| sname:VkVideoSessionParametersKHR can contain. |
| * pname:pParametersAddInfo is `NULL` or a pointer to a |
| slink:VkVideoDecodeH265SessionParametersAddInfoEXT structure specifying |
| H.265 parameters to add upon object creation. |
| |
| include::{generated}/validity/structs/VkVideoDecodeH265SessionParametersCreateInfoEXT.txt[] |
| -- |
| |
| [open,refpage='VkVideoDecodeH265SessionParametersAddInfoEXT',desc='Structure specifies H.265 decoder parameter set information',type='structs'] |
| -- |
| include::{generated}/api/structs/VkVideoDecodeH265SessionParametersAddInfoEXT.txt[] |
| * pname:sType is the type of this structure. |
| * pname:pNext is `NULL` or a pointer to a structure extending this |
| structure. |
| * pname:spsStdCount is the number of SPS elements in the pname:pSpsStd. |
| Its value must: be less than or equal to the value of |
| pname:maxSpsStdCount. |
| * pname:pSpsStd is a pointer to an array of |
| code:StdVideoH265SequenceParameterSet structures representing H.265 |
| sequence parameter sets. |
| Each element of the array must: have a unique H.265 VPS-SPS ID pair. |
| * pname:ppsStdCount is the number of PPS provided in pname:pPpsStd. |
| Its value must: be less than or equal to the value of |
| pname:maxPpsStdCount. |
| * pname:pPpsStd is a pointer to an array of |
| code:StdVideoH265PictureParameterSet structures representing H.265 |
| picture parameter sets. |
| Each element of the array entry must: have a unique H.265 VPS-SPS-PPS ID |
| tuple. |
| |
| .Valid Usage |
| **** |
| * [[VUID-VkVideoDecodeH265SessionParametersAddInfoEXT-vpsStdCount-04829]] |
| The values of pname:vpsStdCount, pname:spsStdCount and pname:ppsStdCount |
| must: be less than or equal to the values of pname:maxVpsStdCount, |
| pname:maxSpsStdCount and pname:maxPpsStdCount, respectively |
| * [[VUID-VkVideoDecodeH265SessionParametersAddInfoEXT-maxVpsStdCount-04830]] |
| When the pname:maxVpsStdCount number of parameters of type |
| StdVideoH265VideoParameterSet in the Video Session Parameters object is |
| reached, no additional parameters of that type can be added to the |
| object. |
| ename:VK_ERROR_TOO_MANY_OBJECTS will be returned if an attempt is made |
| to add additional data to this object at this point |
| * [[VUID-VkVideoDecodeH265SessionParametersAddInfoEXT-maxSpsStdCount-04831]] |
| When the pname:maxSpsStdCount number of parameters of type |
| StdVideoH265SequenceParameterSet in the Video Session Parameters object |
| is reached, no additional parameters of that type can be added to the |
| object. |
| ename:VK_ERROR_TOO_MANY_OBJECTS will be returned if an attempt is made |
| to add additional data to this object at this point |
| * [[VUID-VkVideoDecodeH265SessionParametersAddInfoEXT-maxPpsStdCount-04832]] |
| When the pname:maxPpsStdCount number of parameters of type |
| StdVideoH265PictureParameterSet in the Video Session Parameters object |
| is reached, no additional parameters of that type can be added to the |
| object. |
| ename:VK_ERROR_TOO_MANY_OBJECTS will be returned if an attempt is made |
| to add additional data to this object at this point |
| * [[VUID-VkVideoDecodeH265SessionParametersAddInfoEXT-None-04833]] |
| Each entry to be added must: have a unique, to the rest of the parameter |
| array entries and the existing parameters in the Video Session |
| Parameters Object that is being updated, VPS-SPS-PPS IDs |
| * [[VUID-VkVideoDecodeH265SessionParametersAddInfoEXT-None-04834]] |
| Parameter entries that already exist in Video Session Parameters object |
| with a particular VPS-SPS-PPS IDs cannot: be replaced nor updated |
| * [[VUID-VkVideoDecodeH265SessionParametersAddInfoEXT-None-04835]] |
| When creating a new object using a Video Session Parameters as a |
| template, the array's parameters with the same VPS-SPS-PPS IDs as the |
| ones from the template take precedence |
| * [[VUID-VkVideoDecodeH265SessionParametersAddInfoEXT-None-04836]] |
| VPS/SPS/PPS parameters must: comply with the limits specified in |
| slink:VkVideoSessionCreateInfoKHR during Video Session creation |
| **** |
| |
| include::{generated}/validity/structs/VkVideoDecodeH265SessionParametersAddInfoEXT.txt[] |
| -- |
| |
| |
| === Picture Parameters |
| |
| [open,refpage='VkVideoDecodeH265PictureInfoEXT',desc='Structure specifies H.265 picture information when decoding a frame',type='structs'] |
| -- |
| The slink:VkVideoDecodeH265PictureInfoEXT structure is defined as: |
| |
| include::{generated}/api/structs/VkVideoDecodeH265PictureInfoEXT.txt[] |
| * pname:sType is the type of this structure. |
| * pname:pNext is `NULL` or a pointer to a structure extending this |
| structure. |
| * pname:pStdPictureInfo is a pointer to a |
| code:StdVideoDecodeH265PictureInfo structure specifying codec standard |
| specific picture information from the H.265 specification. |
| * pname:slicesCount is the number of slices in this picture. |
| * pname:pSlicesDataOffsets is a pointer to an array of pname:slicesCount |
| offsets indicating the start offset of each slice within the bitstream |
| buffer. |
| |
| include::{generated}/validity/structs/VkVideoDecodeH265PictureInfoEXT.txt[] |
| -- |
| |
| [open,refpage='VkVideoDecodeH265DpbSlotInfoEXT',desc='Structure specifies H.265 DPB information when decoding a frame',type='structs'] |
| -- |
| The slink:VkVideoDecodeH265DpbSlotInfoEXT structure is defined as: |
| |
| include::{generated}/api/structs/VkVideoDecodeH265DpbSlotInfoEXT.txt[] |
| * pname:sType is the type of this structure. |
| * pname:pNext is `NULL` or a pointer to a structure extending this |
| structure. |
| * pname:pStdReferenceInfo is a pointer to a |
| code:StdVideoDecodeH265ReferenceInfo structure specifying the codec |
| standard specific picture reference information from the H.264 |
| specification. |
| |
| include::{generated}/validity/structs/VkVideoDecodeH265DpbSlotInfoEXT.txt[] |
| -- |
| |
